diff --git a/examples/draft-revise-loop.py b/examples/draft-revise-loop.py
index 28fea5e36..eb90e2872 100644
--- a/examples/draft-revise-loop.py
+++ b/examples/draft-revise-loop.py
@@ -2,8 +2,8 @@ from __future__ import annotations
 
 from langchain.chat_models.openai import ChatOpenAI
 from langchain.output_parsers.openai_functions import JsonOutputFunctionsParser
-from langchain.prompts import SystemMessagePromptTemplate
-from langchain.schema.output_parser import StrOutputParser
+from langchain_core.output_parsers import StrOutputParser
+from langchain_core.prompts import SystemMessagePromptTemplate
 
 from permchain import Channel, Pregel
 
diff --git a/examples/rag.py b/examples/rag.py
index 14a5a5c50..392288de2 100644
--- a/examples/rag.py
+++ b/examples/rag.py
@@ -1,8 +1,8 @@
 from langchain.chat_models import ChatOpenAI
 from langchain.embeddings import OpenAIEmbeddings
-from langchain.prompts import PromptTemplate
-from langchain.schema.messages import AIMessage, AnyMessage, FunctionMessage
 from langchain.vectorstores import FAISS
+from langchain_core.messages import AIMessage, AnyMessage, FunctionMessage
+from langchain_core.prompts import PromptTemplate
 
 from permchain import Channel, Pregel
 from permchain.channels import Topic
diff --git a/examples/recursive-web-loader.py b/examples/recursive-web-loader.py
index 5d4b8fae1..346b890c2 100644
--- a/examples/recursive-web-loader.py
+++ b/examples/recursive-web-loader.py
@@ -2,9 +2,9 @@ from contextlib import asynccontextmanager, contextmanager
 from typing import AsyncGenerator, Callable, FrozenSet, Generator, Optional, TypedDict
 
 import httpx
-from langchain.schema import Document
-from langchain.schema.runnable import RunnableLambda, RunnablePassthrough
-from langchain.utils.html import extract_sub_links
+from langchain_core.documents import Document
+from langchain_core.runnables import RunnableLambda, RunnablePassthrough
+from langchain_core.utils.html import extract_sub_links
 
 from permchain import Channel, Pregel
 from permchain.channels.context import Context
diff --git a/permchain/channels/base.py b/permchain/channels/base.py
index 13b334c2b..ab951e42e 100644
--- a/permchain/channels/base.py
+++ b/permchain/channels/base.py
@@ -116,7 +116,13 @@ def create_checkpoint(
     checkpoint: Checkpoint, channels: Mapping[str, BaseChannel]
 ) -> Checkpoint:
     """Create a checkpoint for the given channels."""
-    checkpoint = Checkpoint(checkpoint, v=1, ts=datetime.now(timezone.utc).isoformat())
+    checkpoint = Checkpoint(
+        v=1,
+        ts=datetime.now(timezone.utc).isoformat(),
+        channel_values=checkpoint["channel_values"],
+        channel_versions=checkpoint["channel_versions"],
+        versions_seen=checkpoint["versions_seen"],
+    )
     for k, v in channels.items():
         try:
             checkpoint["channel_values"][k] = v.checkpoint()
diff --git a/permchain/checkpoint/base.py b/permchain/checkpoint/base.py
index beb52f8ce..b43cea377 100644
--- a/permchain/checkpoint/base.py
+++ b/permchain/checkpoint/base.py
@@ -4,10 +4,10 @@ from collections import defaultdict
 from datetime import datetime, timezone
 from typing import Any, TypedDict
 
-from langchain.load.serializable import Serializable
-from langchain.pydantic_v1 import Field
-from langchain.schema.runnable import RunnableConfig
-from langchain.schema.runnable.utils import ConfigurableFieldSpec
+from langchain_core.load.serializable import Serializable
+from langchain_core.pydantic_v1 import Field
+from langchain_core.runnables import RunnableConfig
+from langchain_core.runnables.utils import ConfigurableFieldSpec
 
 from permchain.utils import StrEnum
 
diff --git a/permchain/checkpoint/memory.py b/permchain/checkpoint/memory.py
index f58144078..7b150203f 100644
--- a/permchain/checkpoint/memory.py
+++ b/permchain/checkpoint/memory.py
@@ -1,6 +1,6 @@
-from langchain.pydantic_v1 import Field
-from langchain.schema.runnable import RunnableConfig
-from langchain.schema.runnable.utils import ConfigurableFieldSpec
+from langchain_core.pydantic_v1 import Field
+from langchain_core.runnables import RunnableConfig
+from langchain_core.runnables.utils import ConfigurableFieldSpec
 
 from permchain.checkpoint.base import BaseCheckpointAdapter, Checkpoint
 
diff --git a/permchain/pregel/__init__.py b/permchain/pregel/__init__.py
index 31595be4d..eff58980b 100644
--- a/permchain/pregel/__init__.py
+++ b/permchain/pregel/__init__.py
@@ -19,23 +19,23 @@ from typing import (
     overload,
 )
 
-from langchain.callbacks.manager import (
+from langchain_core.callbacks.manager import (
     AsyncCallbackManagerForChainRun,
     CallbackManagerForChainRun,
 )
-from langchain.globals import get_debug
-from langchain.pydantic_v1 import BaseModel, Field, create_model, root_validator
-from langchain.schema.runnable import (
+from langchain_core.globals import get_debug
+from langchain_core.pydantic_v1 import BaseModel, Field, create_model, root_validator
+from langchain_core.runnables import (
     Runnable,
     RunnableSerializable,
 )
-from langchain.schema.runnable.base import Input, Output, coerce_to_runnable
-from langchain.schema.runnable.config import (
+from langchain_core.runnables.base import Input, Output, coerce_to_runnable
+from langchain_core.runnables.config import (
     RunnableConfig,
     get_executor_for_config,
     patch_config,
 )
-from langchain.schema.runnable.utils import (
+from langchain_core.runnables.utils import (
     ConfigurableFieldSpec,
     get_unique_config_specs,
 )
@@ -433,10 +433,10 @@ class Pregel(RunnableSerializable[dict[str, Any] | Any, dict[str, Any] | Any]):
         config: RunnableConfig | None = None,
         **kwargs: Any,
     ) -> Iterator[tuple[dict[str, Any] | Any, CheckpointView]]:
-        for output, view in self._transform_stream_with_config(
+        for tup in self._transform_stream_with_config(
             iter([input]), self._transform, config, **kwargs
         ):
-            yield output, view
+            yield cast(tuple[dict[str, Any] | Any, CheckpointView], tup)
 
     async def ainvoke(
         self,
@@ -482,10 +482,10 @@ class Pregel(RunnableSerializable[dict[str, Any] | Any, dict[str, Any] | Any]):
         async def input_stream() -> AsyncIterator[dict[str, Any] | Any]:
             yield input
 
-        async for output, view in self._atransform_stream_with_config(
+        async for tup in self._atransform_stream_with_config(
             input_stream(), self._atransform, config, **kwargs
         ):
-            yield output, view
+            yield cast(tuple[dict[str, Any] | Any, CheckpointView], tup)
 
 
 def _interrupt_or_proceed(
@@ -590,7 +590,7 @@ def _prepare_next_tasks(
             ):
                 # If all channels subscribed by this process have been initialized
                 try:
-                    val = {
+                    val: Any = {
                         k: _read_channel(
                             channels, chan, catch=chan not in proc.triggers
                         )
diff --git a/permchain/pregel/debug.py b/permchain/pregel/debug.py
index 613749858..c1e3cc2be 100644
--- a/permchain/pregel/debug.py
+++ b/permchain/pregel/debug.py
@@ -1,8 +1,8 @@
 from pprint import pformat
 from typing import Any, Iterator, Mapping
 
-from langchain.schema.runnable import Runnable
-from langchain.utils.input import get_bolded_text, get_colored_text
+from langchain_core.runnables import Runnable
+from langchain_core.utils.input import get_bolded_text, get_colored_text
 
 from permchain.channels.base import BaseChannel, EmptyChannelError
 
diff --git a/permchain/pregel/io.py b/permchain/pregel/io.py
index 618a2387e..d49193b49 100644
--- a/permchain/pregel/io.py
+++ b/permchain/pregel/io.py
@@ -34,3 +34,4 @@ def map_output(
     else:
         if updated := {c for c, _ in pending_writes if c in output_channels}:
             return {chan: channels[chan].get() for chan in updated}
+    return None
diff --git a/permchain/pregel/read.py b/permchain/pregel/read.py
index bcd96f4cf..1c9b1dc13 100644
--- a/permchain/pregel/read.py
+++ b/permchain/pregel/read.py
@@ -2,7 +2,7 @@ from __future__ import annotations
 
 from typing import Any, Callable, List, Mapping, Optional, Sequence
 
-from langchain.pydantic_v1 import Field
+from langchain_core.pydantic_v1 import Field
 from langchain_core.runnables import (
     Runnable,
     RunnableConfig,
diff --git a/permchain/pregel/write.py b/permchain/pregel/write.py
index 5174096f2..3c21d39c8 100644
--- a/permchain/pregel/write.py
+++ b/permchain/pregel/write.py
@@ -2,12 +2,12 @@ from __future__ import annotations
 
 from typing import Any, Callable, Sequence
 
-from langchain.schema.runnable import (
+from langchain_core.runnables import (
     Runnable,
     RunnableConfig,
     RunnablePassthrough,
 )
-from langchain.schema.runnable.utils import ConfigurableFieldSpec
+from langchain_core.runnables.utils import ConfigurableFieldSpec
 
 from permchain.constants import CONFIG_KEY_SEND
 
diff --git a/poetry.lock b/poetry.lock
index 60bbf53bc..9f474956c 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -826,72 +826,73 @@ files = [
 
 [[package]]
 name = "greenlet"
-version = "3.0.1"
+version = "3.0.3"
 description = "Lightweight in-process concurrent programming"
 optional = false
 python-versions = ">=3.7"
 files = [
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 [package.extras]
-docs = ["Sphinx"]
+docs = ["Sphinx", "furo"]
 test = ["objgraph", "psutil"]
 
 [[package]]
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 ]
 
 [package.dependencies]
@@ -3133,7 +3134,7 @@ typing-extensions = ">=4.2.0"
 [package.extras]
 aiomysql = ["aiomysql (>=0.2.0)", "greenlet (!=0.4.17)"]
 aioodbc = ["aioodbc", "greenlet (!=0.4.17)"]
-aiosqlite = ["aiosqlite", "greenlet (!=0.4.17)", "typing-extensions (!=3.10.0.1)"]
+aiosqlite = ["aiosqlite", "greenlet (!=0.4.17)", "typing_extensions (!=3.10.0.1)"]
 asyncio = ["greenlet (!=0.4.17)"]
 asyncmy = ["asyncmy (>=0.2.3,!=0.2.4,!=0.2.6)", "greenlet (!=0.4.17)"]
 mariadb-connector = ["mariadb (>=1.0.1,!=1.1.2,!=1.1.5)"]
@@ -3143,7 +3144,7 @@ mssql-pyodbc = ["pyodbc"]
 mypy = ["mypy (>=0.910)"]
 mysql = ["mysqlclient (>=1.4.0)"]
 mysql-connector = ["mysql-connector-python"]
-oracle = ["cx-oracle (>=8)"]
+oracle = ["cx_oracle (>=8)"]
 oracle-oracledb = ["oracledb (>=1.0.1)"]
 postgresql = ["psycopg2 (>=2.7)"]
 postgresql-asyncpg = ["asyncpg", "greenlet (!=0.4.17)"]
@@ -3153,7 +3154,7 @@ postgresql-psycopg2binary = ["psycopg2-binary"]
 postgresql-psycopg2cffi = ["psycopg2cffi"]
 postgresql-psycopgbinary = ["psycopg[binary] (>=3.0.7)"]
 pymysql = ["pymysql"]
-sqlcipher = ["sqlcipher3-binary"]
+sqlcipher = ["sqlcipher3_binary"]
 
 [[package]]
 name = "stack-data"
@@ -3598,4 +3599,4 @@ testing = ["big-O", "jaraco.functools", "jaraco.itertools", "more-itertools", "p
 [metadata]
 lock-version = "2.0"
 python-versions = ">=3.8.1,<4.0"
-content-hash = "31c0918244f47b18e634bb487f32918ff5fde3ecc84dcd416b955b1077ffe663"
+content-hash = "2777c34c9c1b5c056206649d287e08e55671a647721374fb7c3b6edc711e796e"
diff --git a/pyproject.toml b/pyproject.toml
index 43d8ba149..40536ecf9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -9,7 +9,7 @@ repository = "https://www.github.com/langchain-ai/permchain"
 
 [tool.poetry.dependencies]
 python = ">=3.8.1,<4.0"
-langchain = "^0.0.352"
+langchain-core = "^0.1.3"
 
 
 [tool.poetry.group.test.dependencies]
@@ -37,6 +37,7 @@ optional = true
 [tool.poetry.group.dev.dependencies]
 jupyter = "^1.0.0"
 openai = "^0.27.8"
+langchain = "^0.0.352"
 
 [tool.ruff]
 select = [ "E", "F", "I" ]
diff --git a/tests/test_pregel.py b/tests/test_pregel.py
index ac96b8f42..aad297018 100644
--- a/tests/test_pregel.py
+++ b/tests/test_pregel.py
@@ -5,7 +5,7 @@ from contextlib import contextmanager
 from typing import Generator
 
 import pytest
-from langchain.schema.runnable import RunnablePassthrough
+from langchain_core.runnables import RunnablePassthrough
 from pytest_mock import MockerFixture
 
 from permchain import Channel, Pregel
diff --git a/tests/test_pregel_async.py b/tests/test_pregel_async.py
index 5008def73..b32dc17d2 100644
--- a/tests/test_pregel_async.py
+++ b/tests/test_pregel_async.py
@@ -4,7 +4,7 @@ from contextlib import asynccontextmanager, contextmanager
 from typing import Any, AsyncGenerator, AsyncIterator, Generator
 
 import pytest
-from langchain.schema.runnable import RunnablePassthrough
+from langchain_core.runnables import RunnablePassthrough
 from pytest_mock import MockerFixture
 
 from permchain import Channel, Pregel